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Results: 1 through 50 of 152 (0.085 secs)
You searched for: subject:"UNSTEADY FLOW"
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[texts]Wave rotor technology status and research progress report - Shreeve, Raymond P;Mathur, Atol B;Eidelman, S;Erwin, J
Final report ; 1 May -31 October 1982
Keywords: UNSTEADY FLOW
Downloads: 93
[texts]Circulation control airfoil study : progress report no 4 - Schmidt, Louis Vincent
Title from cover
Keywords: Aerofoils; Unsteady flow (Aerodynamics)
Downloads: 75
[texts]In-line and transverse forces on smooth and rough cylinders in oscillatory flow at high Reynolds numbers - Sarpkaya, Turgut, 1928-
Interim report for period July 1985 - July 1986."
Keywords: UNSTEADY FLOW; OSCILLATION; HYDRODYNAMICS
Downloads: 94
[texts]Development of a real-time hybrid computer simulation for the 3K-SES, 5 DOF, data-based program : part I: familiarization and planning - Gerba, Alex.;Thaler, George J.
Progress report period ending June 1979--Cover.
Keywords: AEROFOILS; UNSTEADY FLOW (AERODYNAMICS)
Downloads: 79
[texts]The development of a computer code (U2DIIF)--for the numerical solution of unsteady - Teng, Ngai-Huat.
Available from National Technical Information Service, Springfield, Va
Keywords: UNSTEADY FLOW; COMPUTER PROGRAMS; AIRFOILS
Downloads: 140
[texts]Wind Tunnel Testing with Fast Time-Response PSP - Schairer, Edward
Although proven successful for steady pressure measurements, extension of the pressure-sensitive paint (PSP) technique to unsteady flows, especially for rotorcraft, is considered quite difficult. This is partly because of the complex chemistry of a pressure-sensitive paint which has both fast time- response (greater than 1 kilohertz (kHz) as opposed to a typical PSP time response of 1 hertz (Hz)) and a self-referencing capability (often provided by adding a second pressure-insensitive luminescen...
Keywords: VORTEX RINGS; MODELS; UNSTEADY FLOW; PISTONS
Downloads: 92
[texts]Further development of a one-dimensional unsteady Euler code for wave rotor applications - Johnston, David T.
"NPS 67-87-002."
Keywords: Aeronautics; Unsteady flow (Aerodynamics); Aerodynamics; Data processing
Downloads: 87
[texts]Linearized unsteady nonequilibrium flows of compressible gas - Sislyan, Zh. S
Linearized unsteady nonequilibrium flows of compressible gas
Keywords: COMPRESSIBLE FLUIDS; GAS FLOW; NONEQUILIBRIUM FLOW; UNSTEADY FLOW; COMPRESSIBLE FLUID; NONEQUILIBRIUM FLOW; UNSTEADY FLOW
Downloads: 87
[texts]HEAT-TRANSFER MEASUREMENTS ON A CONCAVE HEMISPHERICAL NOSE SHAPE WITH UNSTEADY-FLOW EFFECTS AT MACH NUMBERS OF 1.98 AND 4.95 - Beckwith, I. E.
Heat transfer on concave hemispherical nose shape with unsteady flow effect
Keywords: FLOW VELOCITY; HEAT TRANSFER; HEMISPHERES; MACH NUMBER; SHAPES; UNSTEADY FLOW; HEMISPHERE; UNSTEADY FLOW
Downloads: 109
[texts]CFD Analysis of Arc-Jet and Flight Environments for the B-2 Flight Experiment - Loomis, Mark
Ames Research Center has been developing new ultrahigh temperature ceramics (UHTC) for potential use in the sharp leading edges of future space vehicles. These materials have been developed and tested in ground-based arc-jet facilities, and a flight test program called SHARP (slender hypervelocity research aerothermodynamic research probes) has been initiated. The first flight demonstration, SHARP-61, incorporated a 0.141 -inch-radius UHTC nose-tip on a U.S...
Keywords: TIME DEPENDENCE; UNSTEADY FLOW; FLOW VISUALIZATION; COMPUTATIONAL FLUID DYNAMICS
Downloads: 28
[texts]Study program to improve fuel cell performance by pulsing techniques quarterly report, period ending feb. 28, 1965 - Kronenberg, M. L
Pulsing techniques to improve fuel cell performance
Keywords: FUEL CELLS; UNSTEADY FLOW; FUEL CELL; PULSATING FLOW
Downloads: 107
[texts]Effect of the acceleration of enlongated bodies of revolution upon the resistance in a compressible flow - Langley Aeronautical Laboratory
http://uf.catalog.fcla.edu/uf.jsp?st=UF003759947&ix=nu&I=0&V=D&pm=1
Keywords: Body of revolution; Two-body problem; Aerodynamics; Unsteady flow (Aerodynamics
Downloads: 116
[texts]Two-dimensional unsteady flow in a traveling wave plasma accelerator - Peyret, R
Two-dimensional unsteady flow in traveling wave plasma accelerator studied using small perturbation theory
Keywords: LAPLACE TRANSFORMATION; TWO-DIMENSIONAL FLOW; UNSTEADY FLOW; PERTURBATION THEORY; PLASMA ACCELERATORS; TRAVELING WAVES; TWO DIMENSIONAL FLOW; UNSTEADY FLOW; PERTURBATION THEORY; PLASMA ACCELERATOR; TRAVELING WAVE
Downloads: 96
[texts]Effect of Various Parameters on the Flapping Motion of an Aerofoil
Unsteady Reynolds-averaged Navier-Stokes (RANS) computations are presented for the flow past a flapping NACA 0012 aerofoil to study the effect of various motion parameters on the propulsive efficiency and thrust coefficient. The RANS solver used  to obtain  the timeaccurate solutions is based on an implicit dual time stepping scheme with finite volume nodal point spatial discretization. The algebraic eddy viscosity model due to Baldwin and Lomax is used for the turbulence closure...
Keywords: Unsteady Flow; RANS Solver; Implicit Method; Dual Time Stepping; Flapping Aerofoil
Downloads: 18
[texts]Infrared Communications for Small Spacecraft: From a Wireless Bus to Cluster Concepts - Webb, Suzanne C.
Nanosatellites operating singly or in clusters are anticipated for future space science missions. To implement this new communications paradigm, we are approaching cluster communications by first developing an infrared (IR) intra-craft wireless bus capability, following initially the MIL-STD-1553B protocol. Benefits of an IR wireless bus are low mass, size, power, and cost, simplicity of implementation, ease of use, minimum EMI, and efficient and reliable data transfer...
Keywords: BACKWARD DIFFERENCING; NAVIER-STOKES EQUATION; RUNGE-KUTTA METHOD; UNSTEADY FLOW; LAMINAR FLOW; CIRCULAR CYLINDERS; EFFICIENCY; ACCURACY
Downloads: 97
[texts]Alleviation of Facility/Engine Interactions in an Open-Jet Scramjet Test Facility - Albertson, Cindy W.
Results of a series of shakedown tests to eliminate facility/engine interactions in an open-jet scramjet test facility are presented. The tests were conducted with the NASA DFX (Dual-Fuel eXperimental scramjet) engine in the NASA Langley Combustion Heated Scramjet Test Facility (CHSTF) in support of the Hyper-X program, The majority of the tests were conducted at a total enthalpy and pressure corresponding to Mach 5 flight at a dynamic pressure of 734 psf...
Keywords: ACOUSTIC MEASUREMENT; AEROACOUSTICS; SHEAR LAYERS; UNSTEADY FLOW; COMPUTERIZED SIMULATION; FREQUENCY RANGES; NAVIER-STOKES EQUATION; REYNOLDS AVERAGING
Downloads: 77
[texts]On the question of efficient extraction of electrons from a plasma in a vacuum - Kreyndel, Yu. YE., et al
Efficient electron extraction from plasmas in vacuum
Keywords: AERODYNAMIC COEFFICIENTS; TABS (CONTROL SURFACES); UNSTEADY FLOW; MATHEMATICAL MODELS; MATRICES (MATHEMATICS); SUBSONIC FLOW; TWO DIMENSIONAL FLOW
Downloads: 85
[texts]Large Eddy Simulation of Cryogenic Injection Processes at Supercritical Pressure - Oefelein, Joseph C
This paper highlights results from the first of a series of hierarchical simulations aimed at assessing the modeling requirements for application of the large eddy simulation technique to cryogenic injection and combustion processes in liquid rocket engines. The focus is on liquid-oxygen-hydrogen coaxial injectors at a condition where the liquid-oxygen is injected at a subcritical temperature into a supercritical environment...
Keywords: UNSTEADY FLOW; TRANSITION POINTS; AERODYNAMIC STALLING; COMPUTATIONAL FLUID DYNAMICS; NAVIER-STOKES EQUATION; AIRFOILS
Downloads: 138
[texts]Speech commands in control systems - Kyunnap, E
Speech signal voice coders in computer control systems
Keywords: FLOW GEOMETRY; LAMINAR FLOW; LAMINAR WAKES; STREAMLINED BODIES; CONICAL BODIES; PRESSURE; UNSTEADY FLOW; VELOCITY
Downloads: 88
[texts]Scientific Toy - NON
Tensegritoy, inspired by the tensegrity concepts of R. Buckminster Fuller, is an erector set like toy designed to give students an understanding of structural stability. It is used by children, architects, engineers, and teachers. The manufacturer, Tensegrity Systems Corporation, also offers a collapsible point of purchase display which incorporates technology developed for space station trusses described in ''NASA Tech Briefs.'' The tech brief described deployable trusses that can be collapsed ...
Keywords: COMPUTATIONAL FLUID DYNAMICS; BOUNDARY CONDITIONS; SUPERSONIC INLETS; SUPERSONIC FLOW; UNSTEADY FLOW; SUBSONIC FLOW; COMPUTATIONAL GRIDS
Downloads: 140
[texts]Three-dimensional Unsteady Flow over a Heaving Rectangular Wing
Three-dimensional  unsteady RANS computations are performed for the flow past a pure heaving/plunging rectangular wing to study the effect of reduced frequency and heaving amplitude on the thrust generation and propulsive efficiency. The numerical solution has been obtained by using an implicit Reynolds-averaged NavierStokes solver IMPRANS that employs finite volume nodal point spatial discretization scheme with dual time stepping...
Keywords: Unsteady Flow; RANS Solver; Implicit Method; Dual Time Stepping; Heaving or Plunging Wing
Downloads: 43
[texts]A Flight Investigation to Determine the Lateral Oscillatory Damping Acceptable for an Airplane in the Landing Approach - McNeill, Walter E.
An F-86E airplane, in which servo actuation of the ailerons and rudder provides artificial variation of the important lateral and directional aerodynamic stability parameters, has been flown by test pilots of the NASA, U.S. Air Force, and one aircraft manufacturer to determine satisfactory and acceptable levels of lateral oscillatory damping in the landing approach. In addition to normal operational use, particular consideration was given to the emergency condition of failure of stability-augmen...
Keywords: TEMPERATURE DISTRIBUTION; TWO DIMENSIONAL FLOW; COOLING; UNSTEADY FLOW; BLUFF BODIES; WAKES; POTENTIAL FLOW; COMPRESSIBLE FLOW
Downloads: 76
[texts]Implementation of a Computerized Maintenance Management System - Shen, Yong-Hong
A primer Computerized Maintenance Management System (CMMS) has been established for NASA Ames pressure component certification program. The CMMS takes full advantage of the latest computer technology and SQL relational database to perform periodic services for vital pressure components. The Ames certification program is briefly described and the aspects of the CMMS implementation are discussed as they are related to the certification objectives.
Keywords: AIRCRAFT PERFORMANCE; DYNAMIC RESPONSE; ENGINE TESTS; FLIGHT TESTS; THRUST; AIRCRAFT ENGINES; THROTTLING; UNSTEADY FLOW
Downloads: 181
[texts]Structural changes in chromium during deformation - Firstov, S. A.
Structural changes in chromium during high temperature and low temperature deformation, and after annealing
Keywords: BUBBLES; COMPRESSIBLE FLUIDS; INCOMPRESSIBLE FLUIDS; UNSTEADY FLOW; ELASTIC WAVES; NUMERICAL ANALYSIS; PRESSURE DISTRIBUTION; SPHERES; WALL FLOW
Downloads: 91
[texts]AN INVESTIGATION OF COMPACT RADIO EMISSION SOURCES AT A WAVELENGTH OF 3.55 CM - BRODERICK, D. D.
THE RESULTS ARE PRESENTED OF OBSERVATIONS OF THE COMPACT COMPONENTS OF QUASARS AND THE NUCLEI OF RADIO GALAXIES MADE WITH A RADIO INTERFEROMETER HAVING LIMITING ANGULAR RESOLUTION. THE MEASUREMENTS WERE MADE AT A WAVELENGTH OF 3.55 CM BY THE METHOD OF LONG-DISTANCE INTERFEROMETRY WITH THE 22-METER RADIO TELESCOPE OF THE U.S.S.R. ACADEMY OF SCIENCES CRIMEAN ASTROPHYSICAL OBSERVATORY (KAO), THE 42-METER NRAO (USA) TELESCOPE, AND THE 64-METER NASA (USA) TELESCOPE...
Keywords: FLOW RESISTANCE; FRICTION DRAG; PIPE FLOW; UNSTEADY FLOW; FLOW MEASUREMENT; TURBULENT FLOW
Downloads: 89
[texts]Effects of angle of attack and bluntness on the hypersonic flow over a 15 deg semiapex cone in helium - Cleary, J. W.
Angle of attack and bluntness effects on hypersonic flow over 15 deg semiapex cone in helium
Keywords: CHANNEL FLOW; FLOW CHARACTERISTICS; ROTATING CYLINDERS; TURBULENT FLOW; EQUATIONS OF MOTION; FLOW DISTRIBUTION; UNSTEADY FLOW
Downloads: 138
[texts]Differential equations of the equilibrium states of thin elastic shells in the postcritical stage - Alumyae, N. A
No Abstract Available
Keywords: DENSITY (MASS/VOLUME); GAS EXPLOSIONS; NONLINEARITY; VARIABILITY; ONE DIMENSIONAL FLOW; SHOCK WAVES; UNSTEADY FLOW; WAVE PROPAGATION
Downloads: 107
[texts]Scientific publications and presentations relating to planetary quarantine. Volume 5 - The 1969 supplement - Bradley, F. D.
Bibliography on planetary quarantine
Keywords: GAS DYNAMICS; LIQUID FLOW; PRESSURE PULSES; UNSTEADY FLOW; DIMENSIONAL ANALYSIS; INTEGRAL EQUATIONS; LINEARITY; PERTURBATION THEORY
Downloads: 202
[texts]THE EFFECT OF TRYPTOPHAN ON THE SOMATOTROPIC HORMONE DURING SLEEP IN SCHIZOPHRENICS - MURRI, L.
IT IS DETERMINED WHETHER TRYPTOPHAN ADMINISTRATION DURING SLEEP IS ABLE TO INDUCE A RELEASE OF THE SOMATOTROPIC HORMONE IN SCHIZOPHRENIC SUBJECTS.
Keywords: FOILS (MATERIALS); INCOMPRESSIBLE FLUIDS; UNSTEADY FLOW; EQUATIONS OF MOTION; HYDRODYNAMIC EQUATIONS; PERTURBATION THEORY; THIN PLATES
Downloads: 88
[texts]Wind-Tunnel Investigation of Subsonic Longitudinal Aerodynamic Characteristics of a Tiltable-Wing Vertical-Take-Off-and-Landing Supersonic Bomber Configuration Including Turbojet Power Effects - Thompson, Robert F.
Jet-powered model tests were made to determine the low-speed longitudinal aerodynamic characteristics of a vertical-take-off and-landing supersonic bomber configuration. The configuration has an unique engine-wing arrangement wherein six large turbojet engines (three on each side of the fuselage) are buried in a low-aspect-ratio wing which is tilted into the vertical plane for take-off. An essentially two-dimensional variable inlet, spanning the leading edge of each wing semispan, provides air f...
Keywords: UNSTEADY FLOW; WINGS; LINEARITY; BOUNDARY VALUE PROBLEMS; DOWNWASH; INTEGRALS; WING SPAN
Downloads: 132
[texts]Effects of three transmission models in the rotational water-vapor band on radiance calculations and constituent inferences - Whitman, R. I
Transmission model effects on water vapor mixing ratios and radiance calculations for infrared horizon scanners
Keywords: ANGLE OF ATTACK; EQUATIONS OF MOTION; SUPERSONIC FLIGHT; UNSTEADY FLOW; MACH NUMBER; MATHEMATICAL MODELS; PERTURBATION; SHOCK WAVES
Downloads: 63
[texts]Inspection and Verification of Domain Models with PlanWorks and Aver - Bedrax-Weiss, Tania
When developing a domain model, it seems natural to bring the traditional informal tools of inspection and verification, debuggers and automated test suites, to bear upon the problems that will inevitably arise. Debuggers that allow inspection of registers and memory and stepwise execution have been a staple of software development of all sorts from the very beginning. Automated testing has repeatedly proven its considerable worth, to the extent that an entire design philosophy (Test Driven Deve...
Keywords: FLOW DISTRIBUTION; CYCLIC LOADS; INCOMPRESSIBLE FLOW; LOW PRESSURE; NAVIER-STOKES EQUATION; TURBINE PUMPS; UNSTEADY FLOW; COMPRESSIBILITY; FEED SYSTEMS; ANALOGIES
Downloads: 76
[texts]Solar Terrestrial Observatory Space Station Workshop Report - NON
In response to a need to develop and document requirements of the Solar Terrestrial Observatory at an early time, a mini-workshop was organized and held on June 6, 1985. The participants at this workshop set as their goal the preliminary definition of the following areas: (1) instrument descriptions; (2) placement of instrumentation on the IOC Space Station; (3) servicing and repair assessment; and (4) operational scenarios...
Keywords: BOUNDARY LAYER FLOW; UNSTEADY FLOW; WALL FLOW; TAYLOR INSTABILITY; TOLLMIEN-SCHLICHTING WAVES; VORTICES; CHANNEL FLOW; CONCAVITY; CONVEXITY; MODELS; NONLINEARITY
Downloads: 65
[texts]Collaborative Arrival Planning - Zelenka, Ric
The continued expansion of air-traffic and air-carrier economic pressures is necessitating changes in the relationship between the air traffic control service provider and the system user. Such pressures have resulted in efforts to increase the flexibility of air traffic management operations and allow collaboration between the service provider and system user. The government/industry ''free-flight'' initiative, whose ultimate vision is to allow users to select their own flightpath and speed in ...
Keywords: UNSTEADY FLOW; TURBULENCE; COMPUTATION; ACOUSTIC PROPAGATION; FLOW DISTRIBUTION; FLOW MEASUREMENT; ANGLE OF ATTACK; AERODYNAMIC CONFIGURATIONS; MICROPHONES; SIMULATION
Downloads: 61
[texts]Space Vehicle Power System Comprised of Battery/Capacitor Combinations - Camarotte, C.
Recent improvements in energy densities of batteries open the possibility of using electric rather that hydraulic actuators in space vehicle systems. However, the systems usually require short-duration, high-power pulses. This power profile requires the battery system to be sized to meet the power requirements rather than stored energy requirements, often resulting in a large and inefficient energy storage system...
Keywords: CARTESIAN COORDINATES; GRID GENERATION (MATHEMATICS); THREE DIMENSIONAL FLOW; BOUNDARY CONDITIONS; UNSTEADY FLOW; ALGORITHMS; ROBUSTNESS (MATHEMATICS); SIMPLIFICATION; SIMULATION
Downloads: 92
[texts]On the Calculation of Shallow Shells - Ambartsumyan, S. A
This paper considers a sufficiently thin shallow shell of nonzero Gaussian curvature. It also presents a system of symmetrically constructed differential equations, constructed by the mixed method through the stress function and the displpacement function.
Keywords: PERTURBATION; SERIES (MATHEMATICS); SHOCK WAVES; COORDINATES; UNSTEADY FLOW; DUCTED FLOW; COMPRESSIBLE FLUIDS; PERTURBATION THEORY; METHOD OF CHARACTERISTICS; DUCTS; LOGARITHMS
Downloads: 115
[texts]Applications for Mission Operations Using Multi-agent Model-based Instructional Systems with Virtual Environments - Clancey, William J
This viewgraph presentation provides an overview of past and possible future applications for artifical intelligence (AI) in astronaut instruction and training. AI systems have been used in training simulation for the Hubble Space Telescope repair, the International Space Station, and operations simulation for the Mars Exploration Rovers. In the future, robots such as may work as partners with astronauts on missions such as planetary exploration and extravehicular activities.
Keywords: JET FLOW; GAS JETS; UNSTEADY FLOW; FLOW STABILITY; RAREFIED GASES; GAS DENSITY; VELOCITY DISTRIBUTION; FROUDE NUMBER; GRAVITATIONAL EFFECTS
Downloads: 99
[texts]NASA/DOD Aerospace Knowledge Diffusion Research Project. Paper 66: Emerging Trends in the Globalization of Knowledge: The Role of the Technical Report in Aerospace Research and Development - Pinelli,Thomas E.
Economists, management theorists, business strategists, and governments alike recognize knowledge as the single most important resource in today's global economy. Because of its relationship to technological progress and economic growth, many governments have taken a keen interest in knowledge; specifically its production, transfer, and use. This paper focuses on the technical report as a product for disseminating the results of aerospace research and development (R&D) and its use and importance...
Keywords: AXISYMMETRIC FLOW; IMPELLERS; DISTORTION; SURGES; CENTRIFUGAL COMPRESSORS; UNSTEADY FLOW; ROTATING STALLS; MASS FLOW; FLOW STABILITY; STABILITY; OSCILLATIONS
Downloads: 80
[texts]The Distribution of Cosmic-Ray Sources in the Galaxy, Gamma-Rays and the Gradient in the CO-to-H2 Relation - Strong, A. W.
We present a solution to the apparent discrepancy between the radial gradient in the diffuse Galactic gamma-ray emissivity and the distribution of supernova remnants, believed to be the sources of cosmic rays. Recent determinations of the pulsar distribution have made the discrepancy even more apparent. The problem is shown to be plausibly solved by a variation in the Wco-to-N(H2) scaling factor. If this factor increases by a factor of 5-10 from the inner to the outer Galaxy, as expected from th...
Keywords: WIND TUNNEL TESTS; TIME FUNCTIONS; ROTARY WINGS; PRESSURE SENSITIVE PAINTS; PRESSURE MEASUREMENT; UNSTEADY FLOW; ROTORS; ROTARY WING AIRCRAFT
Downloads: 79
[texts]Aeronautical Engineering: A Continuing Bibliography with Indexes - NON
This report lists reports, articles and other documents recently announced in the NASA STI Database.
Keywords: MAGELLANIC CLOUDS; SPECTRA; X RAYS; X RAY BINARIES; ROSAT MISSION; LUMINOSITY; CATACLYSMIC VARIABLES; PULSARS; RADII; UNSTEADY FLOW
Downloads: 135
[texts]Improvements in Raman Lidar Measurements Using New Interference Filter Technology - Whiteman, David N.
Narrow-band interference filters with improved transmission in the ultra-violet have been developed under NASA-funded research and used in the Raman Airborne Spectroscopic Lidar (RASL) in ground-based, upward-looking tests. Measurements were made of atmospheric water vapor, cirrus cloud optical properties and carbon dioxide that improve upon any previously demonstrated using Raman lidar. Daytime boundary and mixed layer profiling of water vapor mixing ratio up to an altitude of approximately 4 h...
Keywords: BUBBLES; SUPPORT SYSTEMS; FLUID DYNAMICS; UNSTEADY FLOW; MICROFLUIDIC DEVICES; DIFFUSION; GAS DENSITY; PRESSURE GRADIENTS; FLOW DISTRIBUTION; SPACE EXPLORATION
Downloads: 111
[texts]Overview of X-38 Hypersonic Aerothermodynamic Wind Tunnel Data and Comparison with Numerical Results - Campbell, C.
A NASA team of engineers has been organized to design a crew return vehicle for returning International Space Station crew members from orbit. The hypersonic aerothermodynamic characteristics of the X-23/X-24A derived X-38 crew return vehicle are being evaluated in various wind tunnels in support of this effort. Aerothermodynamic data from two NASA hypersonic tunnels at Mach 6 and Mach 10 has been obtained with cast ceramic models and a thermographic phosphorus digital imaging system...
Keywords: THRUST VECTOR CONTROL; APPROACH CONTROL; STATIC STABILITY; UNSTEADY FLOW; MOMENTUM TRANSFER; FLIGHT TEST VEHICLES; FEEDBACK CONTROL; ANGULAR MOMENTUM
Downloads: 140
[texts]Aerothermal Study of Mars Pathfinder Aeroshell - Gupta, Roop N.
An aerothermodynamic study of the Mars Pathfinder aeroshell is carried out through a viscous-shock layer (VSL) analysis with and without surface ablation. Stagnation-point results are obtained along a specified trajectory, and detailed calculations along the body are provided at the peak-heating point. The formulation of VSL equations with a new length scale and the implementation of the Vigneron pressure condition predict the extent of the subsonic region and the surface pressure, which compare...
Keywords: THREE DIMENSIONAL FLOW; CENTRIFUGAL COMPRESSORS; ACCURACY; MULTIGRID METHODS; VISCOUS FLOW; INCOMPRESSIBLE FLOW; ROTATION; ROTATING FLUIDS; UNSTEADY FLOW; MARINE PROPULSION; PROPELLERS
Downloads: 167
[texts]Reduction of Wake-Stator Interaction Noise Using Passive Porosity - Tinetti, Ana F.
The present study was conducted to assess the potential of Passive Porosity Technology as a mechanism to reduce interaction noise in turbomachinery by reducing the fluctuating forces acting on the vane surfaces. To do so, a typical fan stator airfoil was subjected to the effects of a transversely moving wake; time histories of the primitive aerodynamic variables, obtained from Computational Fluid Dynamics (CFD) solutions, were then input into an acoustic prediction code...
Keywords: EJECTORS; VORTICES; CYLINDRICAL BODIES; PULSEJET ENGINES; THRUST AUGMENTATION; INTAKE SYSTEMS; PROPULSION SYSTEM PERFORMANCE; UNSTEADY FLOW; GASOLINE; MASS FLOW RATE; ENTRAINMENT
Downloads: 104
[texts]A study of lunar traverse missions - NON
No Abstract Available
Keywords: DELTA WINGS; VORTEX SHEETS; FLOW GEOMETRY; STEADY FLOW; THREE DIMENSIONAL FLOW; UNSTEADY FLOW; ASYMMETRY; LEADING EDGES; NUMERICAL ANALYSIS; PRESSURE DISTRIBUTION
Downloads: 188
[texts]RBSE: Product development team research activity deliverables - NON
The GHG Functions and Extensions to be added to the NASA Electronic Library System (NELS) 1.1 product are described. These functions will implement the 'output request' capability within the Object Browser. The functions will be implemented in two parts. The first part is a code to be added to the Object Browser (X version) to implement menus allowing the user to request that objects be copied to specific media, or that objects be downloaded to the user's system following a specific protocol, or...
Keywords: AERODYNAMIC STALLING; HELICOPTERS; PROGRESS; AIRCRAFT MANEUVERS; AIRFOILS; MACH NUMBER; MANEUVERABILITY; SEPARATED FLOW; UNSTEADY FLOW; BOUNDARY LAYER TRANSITION; FIGHTER AIRCRAFT
Downloads: 228
[texts]BOREAS Level-0 ER-2 Daedalus TMS Imagery Digital Counts in BIL Format - Newcomer, Jeffrey A.
The level-0 Daedalus Thematic Mapper Simulator (TMS) imagery, along with the other remotely sensed images, was collected to provide spatially extensive information about radiant energy over the primary BOReal Ecosystem-Atmosphere Study (BOREAS) study areas. This information includes detailed land cover and biophysical parameter maps such as fraction of Photosynthetically Active Radiation (fPAR) and Leaf Area Index (LAI)...
Keywords: DIMENSIONAL ANALYSIS; GRAPHICAL USER INTERFACE; THREE DIMENSIONAL FLOW; UNSTEADY FLOW; VISCOUS FLOW; TURBINES; TURBOMACHINERY; TURBOPROP ENGINES; NUMERICAL ANALYSIS; COMPUTATIONAL GRIDS
Downloads: 96
[texts]Multidisciplinary Approach to Linear Aerospike Nozzle Optimization - Korte, J. J.
A model of a linear aerospike rocket nozzle that consists of coupled aerodynamic and structural analyses has been developed. A nonlinear computational fluid dynamics code is used to calculate the aerodynamic thrust, and a three-dimensional fink-element model is used to determine the structural response and weight. The model will be used to demonstrate multidisciplinary design optimization (MDO) capabilities for relevant engine concepts, assess performance of various MDO approaches, and provide a...
Keywords: MATHEMATICAL MODELS; AERODYNAMIC DRAG; ROTATING CYLINDERS; SEPARATED FLOW; TURBULENCE MODELS; TURBULENT FLOW; NAVIER-STOKES EQUATION; UNSTEADY FLOW; EDDY VISCOSITY; COMPUTATION
Downloads: 172
[texts]Hydrogen Peroxide Accidents and Incidents: What We Can Learn From History - Greene, Ben
Historical accidents and incidents involving hydrogen peroxide are reviewed and presented. These hydrogen peroxide events are associated with storage, transportation, handling, and disposal and they include exposures, fires, and explosions. Understanding the causes and effects of these accident and incident examples may aid personnel currently working with hydrogen peroxide to mitigate and perhaps avoid similar situations...
Keywords: EJECTORS; GAS MIXTURES; UNSTEADY FLOW; STATISTICAL ANALYSIS; THRUST AUGMENTATION; PULSE DETONATION ENGINES; EXPERIMENT DESIGN; PIPES (TUBES); PARAMETERIZATION; POLYNOMIALS; STOICHIOMETRY; AIR
Downloads: 275
[texts]Vehicle Sketch Pad: a Parametric Geometry Modeler for Conceptual Aircraft Design - Hahn, Andrew S
The conceptual aircraft designer is faced with a dilemma, how to strike the best balance between productivity and fidelity Historically, handbook methods have required only the coarsest of geometric parameterizations in order to perform analysis. Increasingly, there has been a drive to upgrade analysis methods, but these require considerably more precise and detailed geometry. Attempts have been made to use computer-aided design packages to fill this void, but their cost and steep learning curve...
Keywords: UNSTEADY FLOW; STABILITY TESTS; DIFFERENCE EQUATIONS; NAVIER-STOKES EQUATION; REYNOLDS AVERAGING; REYNOLDS EQUATION; ACCURACY; ALGORITHMS; COMPUTATIONAL FLUID DYNAMICS; AVERAGE
Downloads: 235
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